How do I lower my Mg levels

[RPatsula]

here are some of my readings from the past 2 months. my salinity has been consistantly between 1.023 and 1.026

9-19-2013
mg 1040
ca 310
kh 7.0
pH 8.37


10-21-2013
mg 1080
ca 340
kh 5.9
pH 8.33


10-25-2013
mg 1240
ca 325
kh 6.3
pH 8.37

10-29-2013
mg 1480
ca 330
kn 5.8
pH 8.41

10-31-2013
mg 1530
ca 345
kh 6.3
pH 8.39

11-1-2013
mg 1380
ca 350
kh 6.4
pH 8.36

11-4-2013
mg 1520
ca 400
kh 6.4
pH 8.43

11-5-2013
mg 1540
ca 350
kh 6.5
pH 8.42